Add feature flag for connected device

Add feature flag to toggle connected device between new and old
feature.

ConnectedDeviceDashboardFragment will contain new feature will
ConnectedDeviceDashboardFragment2 will hold old feature.

Bug: 69333961
Test: Build
Change-Id: I0ea932c69dea5242129aab994d5142b1f87fbea0

res/xml/connected_devices_old.xml

@@ -0,0 +1,63 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2016 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<PreferenceScreen
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:key="connected_devices_screen"
+    android:title="@string/connected_devices_dashboard_title">
+
+    <com.android.settings.widget.MasterSwitchPreference
+      android:key="toggle_bluetooth"
+      android:title="@string/bluetooth_settings_title"
+      android:icon="@drawable/ic_settings_bluetooth"
+      android:order="-7"/>
+
+    <SwitchPreference
+        android:key="toggle_nfc"
+        android:title="@string/nfc_quick_toggle_title"
+        android:icon="@drawable/ic_nfc"
+        android:summary="@string/nfc_quick_toggle_summary"
+        android:order="-5"/>
+
+    <com.android.settingslib.RestrictedPreference
+        android:fragment="com.android.settings.nfc.AndroidBeam"
+        android:key="android_beam_settings"
+        android:title="@string/android_beam_settings_title"
+        android:icon="@drawable/ic_android"
+        android:order="-4"/>
+
+    <Preference
+        android:key="sms_mirroring"
+        android:title="@string/sms_mirroring_pref"
+        android:icon="@drawable/ic_sms_mirroring_24dp"
+        android:summary="@string/summary_placeholder"
+        android:order="-3"/>
+
+    <Preference
+        android:key="usb_mode"
+        android:title="@string/usb_pref"
+        android:icon="@drawable/ic_usb"
+        android:order="-2">
+        <intent android:action="android.intent.action.MAIN"
+                android:targetPackage="com.android.settings"
+                android:targetClass="com.android.settings.deviceinfo.UsbModeChooserActivity"/>
+    </Preference>
+
+    <PreferenceCategory
+        android:key="dashboard_tile_placeholder"
+        android:order="50"/>
+
+</PreferenceScreen>